Mark code transmission method adopting data punching
A transmission method and technology of marking codes, applied in the application of multi-bit parity error detection coding, data representation error detection/correction, using block codes for error correction/detection, etc., can solve the problem that the data transmission rate needs to be improved, etc. problem, to achieve the effects of shortening the length of the sending sequence code, improving transmission efficiency, reducing system decoding delay and decoding calculation complexity
Pending Publication Date: 2022-05-27
TIANJIN NORMAL UNIVERSITY
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However, the WED-based mark code transmission method still needs to be improved in terms of data transmission rate.
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[0080] In the embodiment of the present invention, the code without data punching is compared with the code after data punching, and the code length N is selected. c The concatenated code with a code rate of 576 bits and a code rate of 0.5 is a special case, and a method of marking code transmission using data puncturing is introduced. In the simulation, the pseudo-random sequence is used as the inner marker code and the binary LDPC code is used as the outer code, where λ=1, N L =720, R L = 0.5, the maximum number of insertion errors for each bit in the channel I is 5, P i =P d , the decoder of the binary LDPC code adopts the logarithmic domain confidence propagation decoding algorithm, and the maximum number of iterations is 50 times.
[0081] Use a binary pseudo-random sequence, where λ=1, P d =P i The maximum number I of insertion errors per bit in the channel is 5. When m=4 and m=6, respectively, the abridged probability P is calculated d The probability of error of...
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The invention discloses a mark code transmission method adopting data punching, which comprises the following steps that: a binary information sequence u generates a coding sequence f with the length of NL through a binary LDPC (Low Density Parity Check) code coder; the mark codes omega are uniformly inserted into the coding sequence f, a cascade code g with the length of Nc is generated, and the cascade code g is output; punching the sigma bit in each symbol in the concatenated code g, wherein punching generates a sending sequence g '; the sending sequence g'generates a receiving sequence h through an insertion / deletion-substitution channel; an insertion / deletion error in the receiving sequence h is corrected through a symbol-level synchronous restorer based on WED, a value beta is assigned to likelihood information at a punching position, and finally a likelihood ratio sequence l is output; the binary LDPC decoder is initialized through the likelihood ratio sequence 1, decoding is carried out on the binary LDPC decoder through a logarithm domain confidence coefficient propagation decoding algorithm, and estimation of an output information sequence is carried out. On the premise of ensuring that the transmission performance of the system is not lost, the transmission rate of the system is improved.
Description
technical field [0001] The invention relates to the field of digital communication error control coding, in particular to a mark code transmission method using data punching. Background technique [0002] Aiming at the synchronization errors caused by the unstable sampling clock rate of communication systems, namely insertion / deletion errors, researchers have designed synchronization error correction codes. Insertion / deletion and substitution errors will lead to catastrophic results, that is, the length of the transceiving sequence is inconsistent and there are a large number of sudden substitution errors, which will reduce the system performance; at the same time, the previous error control coding technology designed for memoryless channels and substitution errors cannot be used directly. [0003] The traditional concatenated coding scheme proposed by Davey and MacKay to correct multiple insertion / deletion and substitution errors, hereinafter referred to as DM code, uses w...
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IPC IPC(8): H03M13/11H03M13/00
CPCH03M13/1125H03M13/6393
Inventor 柳元鲁艺为徐哲李润霖
Owner TIANJIN NORMAL UNIVERSITY